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-rw-r--r--src/math/i386/asinf.s24
1 files changed, 23 insertions, 1 deletions
diff --git a/src/math/i386/asinf.s b/src/math/i386/asinf.s
index e07bf599..05909753 100644
--- a/src/math/i386/asinf.s
+++ b/src/math/i386/asinf.s
@@ -1 +1,23 @@
-# see asin.s
+.global asinf
+.type asinf,@function
+asinf:
+ flds 4(%esp)
+ mov 4(%esp),%eax
+ add %eax,%eax
+ cmp $0x01000000,%eax
+ jb 1f
+ fld %st(0)
+ fld1
+ fsub %st(0),%st(1)
+ fadd %st(2)
+ fmulp
+ fsqrt
+ fpatan
+ fstps 4(%esp)
+ flds 4(%esp)
+ ret
+ # subnormal x, return x with underflow
+1: fld %st(0)
+ fmul %st(1)
+ fstps 4(%esp)
+ ret